Piston-head.



W. THOMPSON.

PSTON HEAD.

APPLICATION FILED 111111.10, 1911.

Patented sept. 12,1911.

2 SHEETS--SHEET l.

WlTN ESS ES ATTORNEY W. THCMPSON.

v Pls'roN HEAD.

` APPLITION FILED MR.10,1911. I 1,003,34. 'Patented Sept. 12, 1911.

2 SHEETS-snm 2.

INVNTO R,

I K. 1 BY y f 4p fwm, 16W

ATTO R N EY Ii'ldllt THQMFEQN, 0F CHESTER, PE'NNSYLVXA, ASSIGNOR F GNE-H'EF TG RMS/IES M. THMPSGN, F CHESTER, PENNSYLVANIA.

Specieation of LLetters Patent.

-s.ppllcazionii March. 3.0, 1911. Serial No. 613,595.

Si? illorton avenue, Chester, Pennsylniza) have vented a new and useful ,li-iston-l'lead, ot which the following 1s a specif nea 'ion has reference to improven'ients in piston heads and 1s designed more 'iparticularly to produce a piston head .vherein the packing readily expansible to produie the requisite litagainst. the inner r: .va'll of the cylinder to prevent leakage' and 'lo take np Wear :troni time to time.

The piston head or" the present invention is designed more particularly torneo in connection `with pumpsl tor different kinds oi. liquid and is susceptible of use in connection'ivith a great variety of pumps, and particularly for Water and like pumps.

ln accordance with the present invention there is provided a piston head carried by a suitable pist-on rod, said head having at an appropriate intermediate distance trom the longitudinal axis anannular flange concentric with the piston rod and provided with radially disposed passages for the reception ot' stems formed on or carried by curved followers, which, together define substantially a. cylinder to the exterior of which packing rings are applied, so that these followers may be forced radially to urge the packing rings into engagement with the inner Wall of the cylinder containing the piston head. The ends of the stems of the tollowers .presented toward the longitudinal axis of the pist-on head are tapered and `threaded and receive a threaded tapered sleeve applied to an extension of the piston rod, so that when the sleeve is turned the tollowers may be forced radially outward to expand the packing rings. By the application of appropriate lock nuts the structure inay be held in any position of adjustment against accidental displacement, but readiustrnent is readily made at any time desired.

The invention will be best understood. from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part oli this specification, with the understanding, however, that while the drawings show practical embodiment of the invention the latter is susceptible of various other embodiments Without material change in structure orarrangement of parts, such aswonld entail departure from the present inven- `tion. y

ln the drawings: Figure l is a perspective `View oil the improved piston head. Fig. 2 is an axial sectionv with some parts in elevation. Fig. 3 is a perspective view ot the taper vscrew adjusting sleeve. Fig. 4 is a section on the line 4 4 of Fig. 2. F ig. 5 is a section on the line 5 5 of Fig. 2. Fig. 6 is a perspective View of the piston rod and the piston body applied thereto, other parts being omitted. Fig. 7 is a perspective View of a cap plate employed to .hold the packing rings in place. Fig. 8 is a perspective View .of one of the expansion followers designed to act on the packing rings. l

`Referring to the d awings, there is shown a piston rod l which may, so far as the present invention is concerned, he of any suitable construction. This piston rod terminates at one end in a stein 2 of reduced diameter, there being an annular shoulder 3 at the junction of the stein and main body of the piston rod, While the outer or free end of the reduced' portion 2 is screw threaded, as shown at l.

Applied to the stem 2 is a piston body ymember 5in the form of a disk provided with equi-distantly disposed radial recesses v 6 leading from the periphery of the disk to,y

ward the center and terminating at an annular flange 7 extending trom one face oi the disk in concentric relation to the lonoitudinal axis of the stern '2, this Hangs being, in the particular showing of the drawings, of even diameter throughout and provided With radial slots 8 elongated in the direction of the length of the flange, this liange projecting` from the tace of the disk 5 remote :troni that engaging the shoulder 3, since the body of the piston is seated against the vsaid shoulder 3. The inner Wall of the flange 7 is spaced from the stem 2 for an appropriate distance.

Applied to the exterior of the liange portion 7 of the body member of the piston are followers 9 each in the form of a circular segment and when lying close to the outer. wall ot' the flange 7 forming a nearly complete cylinder, this being the preferred, al- :litigli not a mandatory itc-rin. The length ot each iiollower in Athe directu oit its longitudinal axis 'of generation is substantially that of the .flange 7, although it may be slightly less in length than the flange to prevent binding. Each follower 9 is formed with a eentralradial stem 10 on its 'concaved face, said stem being elongated in the direction of the loneitudinal axis of generation of the segr-nent,liut the stem is of-less length lthan the segment, and is of such size as to 1o freely but quite closely fit a corresponding slot 8 in the cylindrical flange 7, the end of the stem remote from the follower'being tapered lengthwise and formed with screw threads 11 for a purpose which will pres- 15 ently appear. The length of thestem in the direction away from the concaved face of the follower is such that the wider end of the stem will closely approach the stem 2 when the follower is in contact with the outer sur 2o face of the cylindrical flange 7, while the narrow end of the stem 10is at a greater distance from the stem 2.

At the two ends of the follower in line with the stem 1G are lugs 12 and 13, respec- 25 tively, the lug 12 being of a size to enter a respective recess in the disk 5 and the lug 1.3 enteringla like recess 14 n a disk 15 de-4 signed to be applied to the d of thel cylin`\ drical flange 7 remote from the disk 5, the said disk 15 having a central circular opening 16 of a diameter approximately that of the flange 7.

.The two flanges 5 and 15 are designed to confine between them packing Vrings 17, of 35 which but two are shown in the drawings, but it Will be understood that any number of acking rings desirable may be employed. dapted to the stem 2 is a cylindrical sleeve 18 having one end 19 tapered and screw threaded both along the cylindrical portion and the tapered portion, the end 20 of the sleeve'remote from the tapered portion being given the shape of a hexagon for the application of a wrench, although, of course, any other shape than that of a hexagon may be employed. lThe taper screwthreaded end 19 of the sleeve 18 is adapted to engage the screw threads 1.1 of the stems 10 of the followers 9, so that when the sleeve is turned in the proper direction, this being customarily inthe right hand or clockwise direction, the taper ond of the sleeve will be caused to travel along the threaded portions of the stems 10, and since under these conditions the taper end 19 engages the threaded portions of the stems l() with constantly increasing diameter, these stems are forced radially outward from.the longitudinal axis' of the extension 2, und the followers l) participate in such movement and the packing rings 17 are constrained to expand, thusl pre` scnting an increasing outer liameter. and if the outer surfaces of the packing ringsl are already in engagement with the inner wall 65 olE u cylinder in which the piston n|ove-1,tl1e

sleeve 18 may be rotated by a wrench rings will be brought into engagement with the cylinder with increasing pressure, soA

be ell'ectually -15 on the face remote from the cylindrical flange 7, thus forcing the disk l5 into cngagement with the flange 7 and at the saine time locking the sleeve 18 against rotative movement.

` To lock the piston head firmly against the shoulder 3 there is applied to the'tln-eaded end 4 of the extension 2 a nut 22 and beyondl this a jam nut 23, the nut 22 bearing against the corresponding end 2O of the sleeve 18,'

which latter throueh the jam nut 21and disk 15 locks the piston head body against the shoulder 3.

Of course, the piston rod 1 may be otherwise united to the body of the piston head,`

but the nuts 22 and 23 are efficient for the purpose.

In order that excessive friction `may he prevented to the movement of the sleeve 1S to force the followers 9 outwardly, the stems 1() may fit comparatively loosely in the slots 8, and these followers are guided by the lugs y1.2 within the recesses G. Furthermore, the

lugs 18 hold the disk 15 against turning when the nut 21 is forced against the disk and the outer corners of t-he lugs 13 may be rounded, as indicated 'at 24, to facilitate the placing of the packing rings 17 upon the exterior of the followers 9 after the latter have been placed upon the piston body.

ll'lhcnevcr it is desired to tighten the packing it is only necessary to loosen the nuts 23 and 22 and the nut 21, when the applied to the hexagonal end 20, thus causing a radial outward movement of the several followers simultaneously and :1 corresponding expansion ot the packing rings` after which the nut 21 may he tightened inlo jamming position and the nuls 22 und 23 screwed tight in order, thus again locking the several parts of the piston head in position.

-lVh'euit is desirable to renew the packing rings, tl e nutsI 23 and 22 are ren'ioved in order, then lhc sleeve 1S is unserewed after loosening the'nult 21 und the pressure on the packing rings due to the engagement therewith ot the followcrsfl) is relieved, since these followers may ,now more freely toward the central llongitiu'linnl axis ol the piston rod extension 2, and on the removal of the disk l5 the packing rings may lic withdrawn from the followers and new packing rings inlroductul, after which the parts muy be applied in the' ncvcise order of their removal, and suitable adjustments made and the nuts screwed again into lock- Cil ing iosit'ifnn when ine piston is ready for 6. A piston comprising a disk Eike body ing ri being ineinbei with radin] passages; *.jhoien and n inliei' service, the poe g-@llly norman/@d '13m-n im e m @im a5 neo :minder flange in concentric i'ehiion to the i Esq; xj; in *die* i 'minier ufieady deeoifbed. loi'igiindinn anis of the pinion, a reniiiiing r"ne oHo-v have euch :i redini move disk inning redini passages 'therein inmenien hxongl'xon'r. iis Ming; of have?. in the ing" H1@ 1"5 11.1211 p'lSSilgS 1.11 -hdik ik'pO- i i body nie-mbe being guided by ine tion o' fine piston head bodj,7 and miopa?. i'o of the Wniis of ene Ai'iie iziie end of 'the onnnfinr innige ifeinoie iii@ 'i Ui' ne il named disk iike pori'ioin :said nff packing nniy be Snnjmfm Hnge having redini guide passages there,

E in neeee- @new i? expii'ison nienibe s adapted to be minnen, if in@ exigen? i. of ine nmad between the disk' like members P2-:ieeigins of :in indi 'hen rioif in 'die ,Q ge :in erich provided Wih f igin'ns .i 'fh Square packing may be sien" miente@ to a'veie :i ooiresponding FCT @194mb ;K ifm Uf hgfopeesege through the annular Hang-e and 53oA ein one-indi Sqnmie packing may 'ne uge, wi'n fceiniinzsl ings adapten ijo .iespeetve nie ff 'i in ie ink like poi'ion of the pisbody m ile mating disk, e pinion n ieiniina poi-non udzipied 'to i iam/erge die pieton henri sind e n?, end, a threaded adziped io he yiension of the n' ion rod, and povided with :a look nn ndapied to ongage 'tie disk applied to the 'i'ee end oi the 1"; l annnni inng'e, said Seeve .Trini/'nog n portion 90 ieily movaiiaped to noe on the stems 4of the expenie' packing; Sion members o 'force than; 'adiziily out- 'sei nenibee seing plovidee wei-f and nuns adapted 'to'he lnezded poi'u i'eai 1 portions ieper den o j[ne extension of ihe piston rod. 3C it iq'indinn :mis off the nision *L A ison eolnp'ising e disk iike body .f5

I l screw member movable in menioei: Wi i nidi-(11 passages there.. and an nie direcion of the longitudinal finis of the annuler enge in concentric relation 'to the piston in engaging :Motion to the Screw ongindnai exis of the piston, a -i'etziining "i 1 il? 'ii s 'zidiey inombe.ineniber for dink having redini paeeeges therein maionfn ing the 'radial pas ages in the disk like poi- Cf fidi@ wil'h miieiy mov,- 'tion of the, piton head body and zidnpe inning n Siem ex'niinni to the end of die annnier Hanger@ :1 remis. pori'ion in inner: i'ention mote 'frein ine. fnes named disk lile portion, r fingininai eine of die piston., anni a, seid inf having mulini guido Passagen zidzxped to engage iihe 'hiper pei"- tineey ..1 expansion members adapted lo 'ie Steins of I'ndiziiy movzbey be. iidged between the disk like niembeie d; :if #ne actuation of 'ne kitten eieior in ine innige and each provided with firi f n? n in zn Je? with siem afinned to t'zwei'se n Corresponden f K n n :innnini: ing paeseglve through the annular {innge and 45 riian imfiii siens therethrough, ero with ernninzK nge adapted to reepective pas 110 gan. nbeis in' the form of circuler sages in hi. ,lek like poi-tion of the piston .'-iegn'ients and @zich having' :i stein adapted to head 'body and 'ihe mating diskj :i piston e. ei'mnal portion adapted to i1 se "fer-sila die piston heed und thro-nden ine venire? longgiindinzi wie at in; i, d., n tiii'eaed Sleeve :id aped io U5 i eyed Vith ive'inion to h@ extension of the piston rod and provided wiix i oon' nut adapted io engage the .f'iisk e ooi-i'espoiniing Sio in the pison heed rod In *l @zich @mansion nien'inei' Siem hnmng i* with expansion force i-heni radially onnwxi'd, and nuts Said' members' ndelied to iii-e iineznei portion of the of;-

ing .fseni direoiensioii of pinion rnd? the 'fi'ee endo' of' 'vniinazl wie o the stems fr# ffie expansion menibere being i u ianei nini wife f' 'n'ended und the oon-ei- 125' 'spending e i wir ne ieeve being 'tapered and Screw mini ini-intel io engage en' o fiile Steins of the expansion mei i l. pinten ne. disk like portion pifo- 30 r; end. oli' thennnne fin; .eeo u, d portion ninpueii in .et on 'une meins of the expansion members to 120i vided with' radial slots opening at the periphery and with an annular flange extending from one face of the disk likeportion in eoneentricrelation 'to the longitudinal axis of the piston hub, said flange having longitudinally extended radial slots therethrough, expansion members of circular segmental form each providedon the coneav'ed face With a stem adapted to traverse a corresponding slot through the flange and terthfreads formed therein, each of said expansion members having projecting lugs in line With the stem, a retaining disk adapted to the end of the flange remote from the disk portion of the piston body and provided with radially entering recesses matching the radial recesses of the disk like portion of the piston head body, a piston rod having an extension passing axially through the piston 'head, said piston rod also being provided With an abutment for t e piston head, a threaded sleeve having a .ylindrical portion and one end tapered to engage' the threaded portions oi the taper stems of the expansion members, a lock nuten the cylindrical portion of the threaded sleeve, and means for locking the piston head on the piston rod;

9. A piston having a body member of disk like form with an axially extended annular flange provided with axially extended radial passages therethrough and the disk like portion of the body of the piston having periph erally entering recesses matching the slots through the flange, a disk adapted to the end lof the flange remote from the disk like portion of the piston body and also provided .With a central opening and with peri'pherally entering radial recesses corresponding to (he recesses in the disk like body, expansion members of circular mental form, each provided with an axially extended stem adapted to traverse the slof s in the annular flange and having their ends ed to traverse the piston head axially :1nd l,"

terminating in a screw threaded end, a threaded sleeve adapted to the extended por tion of the piston rod and having a cylindri- Cal portion provided With screw threads, :1nd a taper portion provided with screw threads, the taper portion beingadapted to enter the annular flange through the fr *zing in the disk applied thereto andengag threzu'lcd taper ends of the stems members, a lock nut for the cylindrical portion of the screw threaded sleeve, and holding nuts applicable to the threaded end of the piston rod extension.

In testimony, that I claim the l'rnegoiilg as my own, l have hereto ulixed my signai ture in the presence of two witnesses.

W ALTER THOMPSON.

lVitnesses M. F. l-IUMxsnn'r, Brisa. C. Fox.

portion of: the piston of the cxpansioir 

